Breast-drill.



No. 862,069. PATENTED JU'LY'SO, 1907.

H. E.` GOODELL.

. BREAST DRILL. MucA-T1011 FILED ooT.13, 190e.

UNITED sTATEs PATENT oEEioE.

BREAST-DRILL.

Specification of Letters Patent.

Patented July 30, 1907.

.Application filed October 13, 1906. Serial No. 338,870.

To all whom it may concern:

Be it known that l, HENRY E. GooDELL, a citizen of the United States of America, and a resident of Greeniield, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Breast-Drills, of which the following is a full, clear, and exact description.

This invention especially relates to improvements in breast drills and analogous small manually-operated machines such as have a drill, or other tool-carryingspindle, and means for rotating the spindle.

An object of this invention is to provide change speed gearing between the operating crank or handle and the spindle, whereby the spindle may be rotated very rapidly, with comparatively low power, or quite slowly with correspondingly increased power.

Another object of the invention is to improve the construction of the breast drill in respect of details of construction of the machine for increasing the efficioncy, convenience of use, and durability of the same.

The invention consists, in a breast drill, in the combination with a frame and a tool carrying spindle, rotatable therein, of an operating revoluble crank, change speed gearing between said crank and the tool carrying spindle, and means for placing either set of such gearing in operative connection between the revoluble crank and spindle.

The invention furthermore consists in combinations and arrangements of parts, and the constructions of certain of the parts comprised in the improved breast drill, all substantially as hereinafter fully described and set forth in the'claims. f

In the accompanying drawings-Figure l is a rear side elevation of the machine. Fig. 2 is an elevation as seen at right angles to Fig. l, with important parts shown in vertical section as taken on the line 2 2, Fig. l. Fig. 3 is an elevation of a portion of the machine as seen from the opposite side from that shown in Fig. l. Fig. i is a perspective view showing the outer face of the larger one of the bevel gear wheels comprised in the machine and other parts connected therewith. Fig. 5 is a perspective view showing the detail construction of a shiftable stud hereinafter particularly referred to.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings-A represents the frame of the breast drill, the same being of any suitable size and design having at its upper end a breast bearing member B, carrying at its lower portion a spindle C provided with a chuck D for holding a drill or other tool.

E and F and G and H represent two sets of change speed gearing operable between the operating shaft J,- having the handle provided crank K,-and the spindle, either of which set may be in connection, at one time, for the manifest capability of rotating the spindle slowly or rapidly, as may be desired.

The frame A is made in the form of a yoke a at its lower portion having an aperture b therewithin; and the frame below'said aperture has a portion constructed with a longitudinal bore d to make a bearing for the spindle, while in the upper portion of the yoke above said aperture is a socket e, Fig. 2, axially alined with the said bore; and the frame above said socket e is made with an elongated hub through which, and the frame proper, is a transverse bore preferably provided with a hardened bushing sleeve f to constitute a journal bearing for the aforementioned operating shaft J.

The tool spindle C rotatably fitting through said journal bore d and having a portion thereof extended within the recess b in the frame, is provided within its upper end portion with an endwise opening socket c sunk within which is a hardened steel thrust block g.

h represents a stud having the upper end thereof engaged in the aforementioned socket e in the yoke portion of the frame, and having its lower end portion fitted, but free, in the tool spindle socket c and in endwise bearing against the thrust block. The said stud is'provided with an intermediate shoulder h2 to serve as a stop therefor, and to rest against the portion of the frame at the upper boundary of the said aperture b. The bevel gear wheels, F and H, preferably of equal size, are accommodated within the aforesaid aperture in the yoke and are both pinned or otherwise securely affixed to the tool spindle C.

The parts above described in detail constitute simple, practical and easily assembled, as well as durable, provisions in the machine, and while of minor importance, have, nevertheless, considerable utility and are valued.

The bevel gear wheel E in mesh with the upper,or rearward,-bevel gear wheel F, is made with an elongated hub i, the gear and its hub being loosely iitted about the operating shaft J and the said elongated hub has at its outer or forward end a circularlflange j constructed at its edge with a notch c; and the centrally circularly apertured body of the large bevel gear wheel G (which meshes with the lower or forward bevel gear wheel` H fixed on the tool spindle), is loosely fitted about the elongated hub i of the gear wheel E and is constrained against movement or shifting on the line of its axis by being engaged between the face of the gear bevel gear wheel, and also across the outer face oi the flange j pertaining to the smaller bevel gear wheel E, and capable oi free revoluble movements relatively to both of these last named parts, has the slot located as shown at q, longitudinally therein. The stud L slidable in its engagement along the slot is the element which makes the connection between the crank and operating shaft, and either oi the gear wheels G or E, as may be desired.

As shown in Figs. 2 and 3, the larger gear wheel is in lock77 for driving the drill spindle at the fastest speed, during which operation the bevel gear wheel F running fast in unison with the spindle idly drives the bevel gear wheel E; and, of course, when the stud is slid to the inward position to interlock in the notch c in the flange pertaining to the smaller size bevel gear wheel E, this gear wheel will be positively rotated and will secure the rotation of the drill spindle at the slower speed, and correspondingly greater power; and when the spindle is thus operated, the larger' gear wheel, incidentally, will slowly idly revolve. As shown in Fig. 5, the said stud is made with a attened or slabbed intermediate portion t to have a sliding and rotation-preventing engagement in the aforesaid slot said stud also comprises an inwardly extended portion t2 to engage in either of the places m or c therefor; and said stud, iurthermore, has the screw threaded outwardly extending portion p3 for receiving thereon the thumb nut u which, when properly turned and tightened, slightly outwardly draws the stud so that the shoulders t4 thereof are in binding engagement against the inner face of the crank, whereby the interlocked relation before mentioned may be maintained securely and against liability oi an undesirable or accidental termination oi such relations.

This breast drill, as usual, having an operating crank handle transversely extended at one side of the frame, and having the holding and steadying handle o transversely extending at the other side of the trame, has at the inner or upper end of the frame the breast bearing member or brace B arranged ior use transversely of the length ol the frame and in a line at right angles to both the crank handle o and the holding and steadying handle '11.

In this improved drill I have constructed the brace or bearing member B rotatably adjustable on the upper end of the frame so that when the machine is not in usa-and is to be transported, or stowed away,-ior compactness, such part B may be turned to a line parallel with the said handles o and o. Thus, for this capability, the upper spindle like portion w, of the trame Various changes may be made in details oi construction in this machine without departing from the present invention; and certain of the details of construction herein included for a comparative degree of advantage may be omitted or altered without sacrilicing the principal beneficial characteristics comprised in the machine.

I claim:-

l. In a breast drill, the combination with a frame having a tool spindle rotatably mounted therein, provided with two kbevel gear wheels affixed thereto, of a shaft mounted for rotation in the frame at right angles to the tool spindle, having a small sized bevel gear wheel, providedwith an elongated hub and a flange at the end of the hub, loosely mounted on said shaft, a larger'bevel gear wheel loosely mounted on the hub of said shaft supported bevel gear wheel, an operating crank connected to the said shaft, and means for connecting said crank with either of said loosely mounted bevel gear wheels.

2. In a breast drill, the combination with a frame having a tool spindle rotatably mounted therein, provided with two bevel gear wheels afhxed thereto, of a shaft mounted for rotation in the frame at right angles to the tool spindle, having a small sized bevel gear wheel,-pro vided with an elongated hub, and a flange, at the end of the hub, constructed at its edge with a notch,-loosely mounted on said shaft, a larger bevel gear wheel loosely mounted on the hub of said shaft-supported gear wheel, between the body of the latter and its flange, and having an annular r'ib on its outer' face constructed with a recess, an operating crank connected to the said shaft, a stud slidable along the said crank and adapted to engage in either the notch in the ange appur'tenant to the said small gear' wheel, or in the recess in the rib appurtenant to the larger' gear wheel, and means for coniining said stud in either' of its engaging positions.

3. In a breast drill, the combination with a frame having a tool spindle rotatably mounted therein, provided with two bevel gear wheels aflxed ther'eto, of a shaft mounted for rotation in the frame at right angles to the tool spindle, having a small sized bevel gear' Wheel, provided with an elongated hub, and a iiange, at the end of the hub, constructed at its edge with a notch,loosely mounted on said shaft, a larger bevel gear' Wheel loosely mounted on the hub of said shaft-supported gear wheel, between the body of the latter' and its flange, and having an annular' r'ib on its outer face constructed with a recess, an operating crank, connected to the said shaft, extended radially across the outer side of said larger-bevel gear wheel and having a slot longitudinally therein, a stud, having a screw threaded outer extremity, and a shouldered inner portion, slidable along the said crank in the said slot thereof, and adapted to engage either in the said tlange or in the recess in the said rib, and a confining nut screw-engaging on the outer extremity of said stud, and to be set against the side of'the crank, for the purposes set forth.

4. In a breast drill, in combination, a frame constructed with an aperture at a lower' portion thereof having a longitudinal bore for spindle bearing through the portion of the frame below the aperture, having a socket axially alined with said bore above and opening into said recess, and having a transverse bor'e or journal bearing through its portion above said aperture a tool spindle rotatably fitted through said longitudinal bore and having a portion within said trame, having in its upper end portion an endwise opening socket, a stud having an intermediate shoulder comprising a portion below the shoulder' tted in the socket in the tool spindle, and having a portion above the shoulder' fitted in the said socket in the frame, an operating revoluble crank, change speed gearing between the crank and the tool carrying spindle, and means for placing either' set of such gearing in driving connection between the crank and spindle.

5. In a breast drill, in combination, a frame constructed with an aperture at a lower portion thereof having a longitudinal spindle bearing bor'e through the portion of the frame below the aperture, having a socket axially alined with said bore above and opening into said recess, and having a transverse shaft journal bearing bore through its portion above said aperture, a tool spindle rotatably iitted through said longitudinal bore and having a portion thereof extended Within said frame, and provided Within its upper end portion with an endvvise opening socket, and

having a hardened thrust block sunk therewithin, a stud having a lower portion thereof fitted in the said tool spindle socket and endwise bearing against said thrust block, and having its upper portion engaged in the said socket in the frame, an operating revoluble crank, change speed gearing,- between the crank and the tool carrying spindle, and means for placing either set of such gearing in driving connection between the crank and spindle.

Signed by me at Greenfield, Mass., in presence of two subscribing Witnesses.

HENRY E. GOODELL.

Witnesses PERLEY E. FAY, FRANCIS N. THOMPSON. 

